From 3dbe001d6f47c0cf6dd9f34ca746201894a32dd7 Mon Sep 17 00:00:00 2001
From: jmoenig <jens@moenig.org>
Date: Thu, 17 Jul 2014 09:51:25 +0200
Subject: fix List::length to work with stored CS10 projects

---
 lists.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'lists.js')

diff --git a/lists.js b/lists.js
index 1674d1c..c5a7cc6 100644
--- a/lists.js
+++ b/lists.js
@@ -195,11 +195,11 @@ List.prototype.length = function () {
     if (this.isLinked) {
         var pair = this,
             result = 0;
-        while (pair.isLinked) {
+        while (pair && pair.isLinked) {
             result += 1;
             pair = pair.rest;
         }
-        return result + pair.contents.length;
+        return result + (pair ? pair.contents.length : 0);
     }
     return this.contents.length;
 };
-- 
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